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Finding the Fourth Proportional to 21,643,507, 29,868,978.54 and 11,985,715

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Solution

The fourth proportional to 21,643,507, 29,868,978.54 and 11,985,715 is: 16,540,806.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,643,507 : 29,868,978.54 = 11,985,715 : x
  2. Step 2: Convert to fraction form
    21,643,507/29,868,978.54 = 11,985,715/x
  3. Step 3: Cross multiply
    21,643,507x = 29,868,978.54 × 11,985,715
  4. Step 4: Simplify right side
    21,643,507x = 358,001,064,121,556.06
  5. Step 5: Solve for x
    x = 358,001,064,121,556.06/21,643,507
  6. Step 6: Final answer
    x = 16,540,806.63

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.